Method of making paper bags.



C. B. SANDERS.

METHOD OF MAKING PAPER BAGS.. APPLICATION FILED AUG.9. I916.

Patented Dec. 11, 191?.

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v c. B. SANDERS.

METHOD OF MAKING PAPER BAGS. APPLICATION FILED AUG-9. I916.

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.2 SHEETS-BMEET 2 lit) w: e n. sannnas, or non'rcrarn, new annsnr, assrenon ro THE union naea l? COMPANY, OF NEW YORK, N. Y., A CORPORATION F.N1EW JERSEY.

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To all whom it may concern:

Be it known that ll, CHARLES B. sANDERS, a citizen of the United States, residing at Montclair, New Jersey, have invented, certain new and useful Improvements in Methrial No. 111,758. One of the objects of the invention is to produce improved bags of the type which have bellows sides anda square bottom connected by folds with said sides, in such a way that the bag may be opened up into box shape by a'method of procedure which includes incidentally the advantages of producing a better shaped tube; more strength to the tube and lessening the fre quency of the breaking of the paper; making the paste stick better, and decreasing the wear on the draw-rolls by decreasing the preferabl seam in t e tube for such class of bags and.

tension on the tube. These advantages are gained by producing an edge causing the pressure of the surfaces of the draw-rolls to pull u on" the tube directly in line with the paste seam, so that the 1ongitudinal slits, which are necessary in the roper use of well-known bag-bottom-formmg mechanism in forming a bottom, willbe properly disposed.

These being among the objects of the present invention, the same consists of certain steps in the method and manufacture of paper bags, to be hereinafter described and then claimed with reference to the accompanying drawings illustrating a suitable bag-making machine which may be used to carry out the method, and in which- Flgure 1 is a plan of a ortion of a mechanism for forming a be lows folded tube and severing it into blanks, the edges of the web of;paper during the process of folding it into a tube being indicated by dotted of suitable'draw rolls which may be employed, showing the position of the formed paper tube relatively thereto;

Specification of Letters Patent.

1. and 2. The web of paper ma Fatented Tree... 11, 1%1'7.

Application filed August 9, 1916. Serial no. 113,892.

Fig. 4 is a detail sectional view of those portions of the draw rolls which operate directly upon the seam of the paper tube in pulling the tubet'hrough the machine;

Fig. 5 is a plan 'view of a bag blank folded put; and

Fig. 6 is a perspective view showing the said blank folded into a tube.

Referring to the drawings, the frame 10 supports a roll of paper 11 and a pasteholder or receptacle 12, together with guide rollers .13, 14 adjacent the paste-holder.

., Former plates 15, 16 are supported from the frame 10 in any suitable manner, while guide fingers 17 are located near the receiving end-of the former plates. Guide rollers or disks 18, 19 are provided so as to work between the said former plates and act upon the web of paper to produce the bellows folds. Clips 20, 21 are also provided to form guides for the web of paper which, in process of being folded up, moves about as indicated by thedotted lines in Figs.

be conducted to the former plates as in 'cated by said dotted lines, in such a" way that the seam to be formed does not run along the sponds with the other end of the paper roll 11 from that at which the paste-holder 12 is located.

Slitter knives 22, 23 are, mounted on rotary shafts 24, 25 suitably geared together as is well known forthe purpose of slitting the folded web of paper longitudinally. Located between the upper former plate 15 and one of the slitters 22 is a suitable guard devicev 28, which is fully disclosed in my said co-pending application.

Beyond the slitter'knives 22, 23 the draw rolls 34, 35 are located. These are preferably of special construction; and they are adapted to act upon the paper tube directly -in line with the seam so as to pull the tube along the former plates, and pass it to the well known severing and bottom-forming mechanism, notillustrated. Said draw rolls are mounted upon shafts 36, 37 connected by meshed gears 38, 39, whereby the upper shaft may be driven fromthe lower one.

The lower draw roll is-fixedupon the shaft 36, while the draw roll 35 is positively driven therefrom. The draw roll 35 may be composed of two sections secured as by set screws 40 to the shaft 37, the ends of said screws entering a channel in the said shaft so that the said sections may be adjusted relatively to each other or along the shaft. The outer end of the draw roll 35 is reduced so as to receive a-preferably hard steel ring or collar 41 which is driven onto said reduced portion. The position of the ring or collar 41 is such that it is in alinement with the slitter 22 at that side of the machine. The special construction of said ring 41 is shown in Fig. 4, together with the associated part of the other draw roll, and the side. seam of the paper tube producedby the machine illustrated is shown as compressed'between the said draw roll operative portions together with the adjacent side bellows fold. As shown, the draw roll ring 41 presses the pasted edge. of the folded tube onto the unpasted edge, thus pressing and cementing the two edges together and at the same time acting by the rolling contact of the draw 'roll surfaces to pull the tube through the machine by acting directly in line with the pasted seam. To this end the ring orcollar 41 is preferably provided with two grooves 42, 43, with an annular presser I portion 44 located to the side of one groove and an annular presser portion 45' located between said grooves. The function of the annular presser portions is to press upon the pasted edge of the tube so as to press it against the unpasted edge, or vice versa, and this results in squeezing the paste laterally, means'for the lateralmovement or escape of paste being provided by the annular grooves 42, 43. The joint of the seam will thus be pasted preferably 'along two lines represented by the grooves 42, 43, as much of the paste is squeezed out from under the presser portions 44, 45. The number of the grooves may vary with size of bag.

A bag blank such as may be made by the method herein disclosed, is shown in Fig. 5, and one end of the pasted tube is shown in Fig. 6. Preferably in carrying out the method herein disclosed the bag is provided with a side or edge seam, in which case a folded web 46 isused having an intermediate face 47 and an opposite face 48, said faces being intended to produce the front and back of the bag. A bellows fold 46 is formed between the faces 47 and 48, and another bellows fold 46 between the face 47 and the edge 49, which edge during the passage of the folded webthrough the machine is folded over the edge of the upper former plate. The face 48 of the blank receives the paste from the paste-holder which is located at one end of the paper roll, and said face is folded over upon the upper former plate. As shown herein, the paste is applied to the edge 50 of said face 48 instead of to the other edge of the web, but it is possibleto change this manner of applying the paste.

I the machine, the active portions of the draw rolls not only act upon the pasted surfaces of the seam in line with the seam to press the said surfaces firmly together, but they pull in line with the seam and the bellows fold in order to draw the tube along, such scam in the specific illustration of the invention being disposed and located directly over one of the bellows folds 46". The other bellows fold 46 is located in an integral portion of the tube. It will be noted that by pulling the tube along by the edge seam and the bellows fold adjacent thereto, the tube is grasped at five thicknesses or plys which enables the tube to be accurately pulled along so as to register properly with the bottom formmg mechanism for the bag, and eventually to produce a perfect bag. Summing up the matter more or less specifically, it will be seen that an adhesive is applied to the surface of the web directly adjacent one edge of the web of paper, that.

the web is folded longitudinally and bellows folds produced along one edge portion and along a corresponding portion of the folded web between two plain portions thereof, the said edge surface is a'pplied to the opposite edge to form a tube with a sea ad acent one edge portion of the tube, an the edges are pressed together along the line of the seam while pulling the tube along by means of said seam.

It will be understood bythose skilled in the art and who are familiar with the operation and function of the bottom-formin mechanismfor bags of the class mention that the bottoms of the bags can under the present invention be more regularly formed and the formation rendered more certain because there are two slits in each of two integral faces of each bag, whereas in the formerly made bags of said class, one of the faces Was composed of two parts with a seam along the middle and with a slit at each side of the seam. Very frequently the two slits or the arts adjacent them got out of proper positlon for the formation of a'Tegular bottom, and this objection is overcome by the present improvements.

It is obvious that the invention is susceptible of modification, as the apparatus may be variously modified and the steps of the method altered without departing from the scope and spirit of the invention.

What I claim as new is 1. The method .of making paper bags herein described, which consists in applying an adhesive to the surface adjacent one edge of a web of paper, folding the said web longitudinally so as to apply said edge-surface to the opposite edge to form a tube with an edge seam, slitting the opposite faces of said tube along lines parallel with and to one side of said edge seam, and pressing said edges together along the line of said seam While pulling said tube along by said seam.

2. The method of making paper bags herein described, which consists in applying an adhesive to the surface adjacent one edge of aweb of paper, folding the said web longitudinally, and producing bellows folds along one edge portion and along a corresponding portion of said web between two plain portions thereof, applying said edge surface to the opposite edge to form a tube with a seam adjacent one edge portion of said tube, longitudinally slitting the faces of said tube formed by said plain portions to one side only of said seam, and pressing said edges together along the line of said seam while pulling said tube along by said seam.

Signed at Hudson Falls, N. Y. this 28" day of July 1916.

CHARLES B. SANDERS. \Vitnesses: C. B. PALMER,

Bnssm J. WRIGHT. 

